pg_lo_open() opens a Large Object and returns large object resource. The resource encapsulates information about the connection. oid specifies a valid large object oid and mode can be either "r", "w", or "rw". It returns FALSE if there is an error.
Do not close the database connection before closing the large object resource.
To use the large object (lo) interface, it is necessary to enclose it within a transaction block.
Note: This function used to be called pg_loopen().
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